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I understand the TFP recommends a CYA level between 20-30ppm for an indoor pool and the reason would be different than protecting chlorine levels from UV rays.. Mine is commercial indoor pool used for therapy. Temp: 94 degrees Sanitizer: liquid chlorine via Hayward controller direct injection...

Great thank you I will try. If for some reason I need to keep the TA at a minimum of 80 (state regs) is there a different ph I should be shooting for? 7.6, 7.7? Thanks,

Thank you, Yes the CO2 injection is used to lower the pH in place of an acid injection system. I will check the TA of the fill water this week and it sounds like the best solution would be to temporarily suspend the CO2 injection and use muriatic acid to lower the TA and resume once it is in...

Also, failed to mention I have not checked the TA of the fill water (town water supply) which we add 1-2 inches of water/week especially after backwashing which could be contributing.

Please see below for the specifications of my work pool. It is all automated and have the pH set for 7.5 and ORP is currently set at 675mv (jumps up and down a little depending on bather load at the time) and that seems to keep the free chlorine levels right between 2.0 and 2.5 ppm give or take...

Thank you for the replies. I will order those reagents and see if we are holding cc below .2. If I remember correctly I believe someone said that the 2-stage SeaKlear PRS clarifier (which we have) can also help a little bit if we are having issues with cc as well? Thanks

Thank you for the replies. As far as our state regs, yes FC needs to be between 1-3ppm and CC is supposed to be below .2ppm. I did install a UV-lamp when I changed the water out last month (paramount 2-lamp system that supposedly handles up to 90gpm as our flow runs between 60-70gpm, so I am...

I recently purchased a Hayward CAT-4000 ORP/PH controller for my commercial, 24,000 gallon indoor pool. I will be installing in the next few weeks once the electrician wires a GFCI outlet and I am going to be using a 15 gallon stenner pump for the chlorine and I have secured a local gas company...

thanks for the info. That does not seem like too much trouble at all and I would rather do that than be fooling around with gallons of muriatic or HCL to adjust the pH.

Thanks for the info, that makes a lot of sense. Especially since I have a lot of elderly who use the pool and many of them have various skin sensitivities due to a lot of the medications they take so anything that would bring a bit more comfort would be helpful. I am going to make one last...

Thank you for the info. That would make sense to have the sensors on a regular replacement schedule if I decided to go that route and not wait until one fails. Currently I have a back-up replacement motor in case our pump ever goes which they seem to do every few years running constantly. We...

Sorry meant CO2 not O2..typo. Would prefer CO2 vs muriatic acid to control pH, but open to suggestions for or agianst either. I have a small filter room with a gas heater and would rather not have liquid chlorine and muriatic acid in the same general area or potentially 2 competing liquids...

Just changed out the water in my 24,000 gallon, commercial, gunite indoor pool which we were previously using bromine tabs through an off-line automatic brominator. For a lot of reasons (the most being the accumulation of DMH over time). I also just installed a paramount UV-sanitizer sized for...

Anyone have a particular UV light they would recommend? It is for a small (24,000 gallon) commercial indoor pool that currently uses bromine as the sanitizer and has issues with CC over time which I am looking to reduce. I understand it may cause a slight increase in bromine/chlorine demand...

thank you very much!

If I stayed with sodium bromide for this indoor pool would you recommend an automatic liquid chlorine feeder due to the high bather load? I am trying to avoid having to add larger amounts of liquid chlorine nightly/weekly and wonder if this would be a better option going forward? Also, where...

Thank you, I contacted the instructor that taught my CPO course a few years ago and I am waiting to hear back from him on whether CYA is permitted for indoor commercial applications in MA. I am almost positive that is what I was told and I thought it was at one of the courses I took, but I can...

Thank you, I called a local CPI that have take the CPO course through in the past and I am trying to get clarification on whether CYA is allowed in an indoor commercial application in Massachusetts. It seems you would prefer UV over Ozone, is there a particular model or brand that you would...

I have a 24,000 gallon heated, indoor, gunite, commercial pool currently sanitized with bromine tabs via an offline feeder. It has been brought to my attention by several of the experts here that using bromine tabs over time causes a build-up of DMH which reduces the effectiveness of the...

I currently have a heated indoor gunite commercial bromine pool at work and will be changing the water out in about 3 weeks and I am considering changing from the off-line brominator that I have been using to something else to sanitize and would appreciate some suggestions. I would like to...

Thank you

Is there anything that can be done to help clear the water before I change it out? I am due to change the water in about a month when we do our annual deck maintenance and I drain the pool and have the new water delivered. I am going to make the changes suggested with either no longer using...

thank you.

thank you!

thank you

Not sure this is the right thread for a UV light question but seeing as it has to do with sanitation I thought this might be the right one. I was told in the past that the addition of a UV light would be helpful in keeping my CC under control due to the fact that my pool at work is an indoor...

I had a thread about a year ago that answered most of the questions I had about converting from bromine tablets to SWCG for my indoor pool at work, but at the time I had just replaced the water and already began feeding bromine tabs and there was already a significant build up of DMH so I...

Would just using liquid chlorine be problematic without be able to use any CYA? I do have 3 sky lights that let in some sun. If I did use sodium bromide would I still use the off-line brominator? Is sodium bromide tabs or a powder? Thanks

Great, thank you very much. I will get the exact type of bromine tabs we typically use tomorrow. I probably have added about 200lbs of bromine since last complete water change 11 months ago. Never thought my indoor pool at work using bromine could have the same issues as my outdoor pool at home...

I have a 24,000 gallon indoor, gunite therapy pool in Massachusetts. The water readings are tested 4x/day with the taylor test kit recommended on this site. Recently our water has began to get cloudy and I can't seem to figure out why and I am wondering if I am not getting enough filtration...